1802869 - [PDF] Using the drawing function on a zoomed PDF is difficult

Status: NEW

(Firefox :: PDF Viewer, defect)

Description

[Daniel Bodea [:danibodea]]

Attachment: drawing on zoomed PDF is hard.gif

Note

• When the user attempts to zoom in on a PDF document and then uses the function to draw, he will notice that the cursor movement is not properly captured and usually results in an incorrect drawing.

Found in

• Beta v108.0b7

Affected versions

• beta v108.0b7

Tested platforms

• Affected platforms: Windows 10 x32, Windows 10 x64, Mac OS, Ubuntu 22
• Unaffected platforms: -

Steps to reproduce

1. Load a PDF document in the browser
2. Zoom in about 500%
3. Click "Draw" button
4. Draw a few signatures

Expected result

• The signatures are properly drawn

Actual result

• The signatures are improperly drawn

Regression range

• The draw function is a relatively new implementation; The issue is not a regression.

Additional notes

• This issue does not occur when in 100% zoom.
• This issue occurs a little less after waiting some time, but still not as one would expect.
• This could be a performance issue.

Comment 1

[Emil Ghitta, QA [:emilghitta]]

I noticed something similar on macOS 11. If I already have some custom text input or drawings on the pdf and I increase the zoom-in level the text input and drawings disappear and I'm unable to add new text or drawings until they get rendered back on the pdf (but this seems to take a very long time).

Here is a screencast for the macOS behavior (Mozilla account needed).